package network;


import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * Created with IntelliJ IDEA
 * Description:
 * User: Administrator
 * Data: 2023 - 10 - 06
 * Time: 14:46
 */
public class TcpEchoServer {
    private ServerSocket serverSocket = null;
    public TcpEchoServer(int port) throws IOException {
        serverSocket = new ServerSocket(port);
    }
    public void start() throws IOException {
        System.out.println("服务器启动！");
        ExecutorService service = Executors.newCachedThreadPool();
       while (true) {
           Socket clientSocket = serverSocket.accept();
           service.submit(new Runnable() {
               @Override
               public void run() {
                   processConnection(clientSocket);
               }
           });
       }
    }

    public void processConnection(Socket clientSocket) {
        System.out.println("客户端上线！");
        try(InputStream inputStream = clientSocket.getInputStream();
            OutputStream outputStream = clientSocket.getOutputStream()) {
            while (true) {
                Scanner scanner = new Scanner(inputStream);
                if(!scanner.hasNext()) {
                    System.out.printf("[%s : %d] 客户端下线！\n", clientSocket.getInetAddress(),
                            clientSocket.getPort());
                    break;
                }
                String request = scanner.next();
                String respon = process(request);
                PrintWriter printWriter = new PrintWriter(outputStream);
                printWriter.println(respon);
                printWriter.flush();
                System.out.printf("[%s : %d] res = %s, resp = %s\n", clientSocket.getInetAddress(),
                        clientSocket.getPort(), request, respon);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                clientSocket.close();
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
    }
    public String process(String request) {
        return request;
    }

    public static void main(String[] args) throws IOException {
        TcpEchoServer tcpEchoServer = new TcpEchoServer(9090);
        tcpEchoServer.start();
    }
}
